Detachable saw-handle.



, in the. handle.

THOMAS P. J. COLEMAN, OF NEW YORK, N. Y.

DETACHABLE SAW-HANDLE.

Specification of Letters Patent.

Application filed November 14, 1907. Serial No. 402,111.

Patented Sept. 22, 1908.

T 0 all whom it may concern.

Beit known that I, Tnonas P. J. Con-:- MAN, a citizen of the United States, residing in the city of New York, borough of Manhattan, county of New York, and State of New York, have invented certain new and useful Detachable Saw-llamlles, of which the following is a specification.

This invention is a detachable saw handle, especially intended for hand saws, whereby a single handle may be used in connection with a variety of saw blades. In this art it is desirable to provide means for rigidly fastening the handle to the blade in such manner that the blade will not work loose in the handle. Furthermore, the. fastening means between the handle and the blade nmst be simple in construction, easy of operation, and reliable in service. These 0l)]CClS are secured by a device embodying my invention. Furthermore, the invention does not require the employment of a. handle which differs in essential particulars, so far as regards its a pearance and general construction, from t 10 saw handles of the prior art.

The invention consists of a saw handle having a plurality of devices secured therein, said devices being adapted for interlocking engagement with a number of slots in a sawblade, said handle being provided, also, with a locking contrivance adapted for interlocking engagement with a notched part of the saw-blade subsequent to the entry of the first named devices into the slots of the sawblade, as will be hereinafter described.

In the preferred form of the invent-ion, the saw-blade is provided, in addition to the notch above referred to, with a slot in its top edge, and, also, with one or more arcuate slots, each having an oil'set, whereby in-the o )eration of ap ilying the handle to one blade, said handle is firstswung as on. a

ivotand then moved in a straight ath, for the two-fold purpose of, first. ma 'ing the aforesaid plurality of devices enter the arouate slots, and, second, of causing said devices to enter the offsets in the slots, at which time the locking device engages with the notch in the blade.

The device has manifold advantages, chief among which is that of locking the handle and blade so ri idly together that it is ractically impossible for the blade to work oose The devices seated in the ofl'sets of the slots preclude the saw from moving in a longitudinal direction, and in one crosswise direction, within the handle, while the automatic locking device retains the blade from crosswise movement in an op.- Posite direction. The handle is substan tially the same as an ordinary device. The blade is not weakened to any extent by the slots and notches therein. The handle may be easily disconnected, thus permitting a number of blades to be laid closely together and packed compactly in a tool chest, the hand 0 being placed separately in the chest.

in the accompanying drawings, I have illustrated one practical embodiment of the invention, but the construction shown therein is to be understood as illustrative, only, and not as defining the limits of the invention.

Figure l is a side elevation of a saw and handle illustrating the handle partly in section and showing by dotted lines the method of applying and removing the handle to and from the. heel of the blade. Fig. 2- is a top plan vicwof the device shown in Fig. 1. Fig. 3 is an enlarged detail section showing one form of locking device whereby the handle is held against movement relative to the blade, the plane of the section being indicated by the dotted line 33 of Fig. 4. Fig. 4 isa cross section on the line 4-4 of Fig. 3.

A'designates a saw handle and B a saw blade. In its general construction the handle, is similar to ordinary handles for hand saws, that is to say, the handle is provided with the grip, a, the longitudinal kerf or slot, a, and the opening, a. Across the kerf, 0., extends a plurality of screws or rivets, c, d, e, which may be similar to the devices ordinarily used for securing the blade rigidlyin the handle, or I may provide small rivets adapted to be fastened permanently in the handle) acros the kerf, a, therein. The only important change in the ordinary handle which I find necessary to make in order to adapt the handle, A, to meet the requirements of the present invention, consists in the provision of a slot or groove, H, the same being )IOYidEd in the up )01' edge of the handle, a ove the grip, a. s shown in Fig. 3, this longitudinal groove is dovetailed in cross section and at one end said groove opens into the. while at. its other end, it opens through the back edge of the handle.

Th saw, B, is provided in its to edge with a notch, C, the axis of which is su stantially at right angles to the longitudinal arts of the saw-blade. The notch, C, extends inwardly kerf, a,

portion, the offset of the arcuate slot. I), be-

mg indicated at- J'. and the offset of the arouate slot, E, at e. The offsets of the two arcua te slots are parallel to the slot. C. and each arena-to slot is concentric with. or struck from a center indicated at said center being above the bottom end the slot. C- The blade, B, is provided in its rear edge. and just below the top edge thereof, with 'a notch, g, with which is adapted to engage a Eocking device herein shown as an automatic bolt. The notch, g, is provided in the back edge of the blade above the first curved slot. D, said notch being shown more clearly in Fig. 4 of the drawings.

The preferred form of the locking device is a bolt, G, having a beveled nose. I, and a stem, h. Said bolt and its stern are inca-sed within a casing, H, the latter being dovetailed in cross section and adapted to fit sLugly into the dovetailed groove- E. of the handle. The casing. [1. may be fastened rigidly to the handle by suitable means, such as by the screw, 1', which passes t'l'irough a lug, 'i', the latter integral with the casing'and overlapping a solid part of the handle, A, whereby the screw, i, is adapted to be embedded in the handle for the purpose of se-, curing the casing firmly in place It is evident that the screw may be removed and the casing slipped lengthwise in the groove, E, for the purpose of dab-drawing said casing and the locking bolt from position in the grooved part of the handle- The locking bolt is impede-d norznaliyto an exposed )osition by a spring, which is held in place y the guide stem, and is housed within said casing- The locking bolt is provided with a finger piece, k, which extends upwardly from the bolt and is adapted to work in a slot, 1:, the latter being pron'ded in the up an part or cover of the cssing, H. The beveled nose. [11. of the sp pressed bolt is adapted to ride on the of the saw when applying the h blade, and, if desired. the llOiJaiaJ-T formed by the'notch, 9. may be curved s. newhat as at g in Fig. 3, for the pur ose or ermitting the bolt to ride easilv on t 1e edge of the saw when applying the handle to the blade.

To fit the handle to the bladerhe handle is turned to the dotted inclined roczsiiion, C, and the saw is thrust into the s-err' for the screw or rivet, c. to enter the slot. C, and take the position indicated in dotted lines at f. The handle is hen turned in an arc of a circle, the center of which is indicated at f, 65 thus moving the handle to the dotted line position, C, and causing the screws or rivets,-

into the not-ch, g, of said blade, whereby the- -handle and blade are locked-firmly together against relative movement.

From this description it will be seen that the handle is adjusted by first moving it in an arc of a circle and then adjusting it parallel to the heel of the blade. The screws or rivets, d, 6, hold the blade against movement longitudinally in either direction within .the handle; the bottom edges of the slotshold the blade against movement crosswise in a direction toward the back edge, While the bolt, G, engaging with the notch, g, holds the blade against crosswise movement in a direction toward its toothed edge, whereby the saw and the handle are connected rwidly against any possibility of movement 01 the blade within said handle.

In order to disconnect the handle from the blade, the latch, G, is withdrawn by ope-ratin the finger piece, 7:, after which the handle islifted to the dotted line osition, C, and then swung tothe dotted line position, C, whereby the handle can be. withdrawn easily and qulckly from the blade.

My invention possesses many practical advantages, chief among which is the ability of using one handle in connection with a number of saw blades. \Vith my invention, the handle can be disconnected from the blade, a number of blades can be packed closely together and placed in a chest, and

The casing and the bolt are concealed by and within the handle, the screw, i, serving to fixedly secure the casing to said handle 1n a way which permits it to be readily removed for replacing or repairing the 5 Wing. The saw b pared for use in connection with the detachable handle. It is to be observed in this connection that the slots, (1, D, E, are easily cut, punched or stamped in the blade at the time of its manufacture, or subsequently thereto. The slots are spaced at the top and ade can be easily and c ieaply pre-.

back edges of the blade so as to leave a substantial amount of metal between them, thus overeomin any tendency to weaken the blade by t he lrovision of the slots therein.

If desired, may use the ordinary screws employed for fastening the blade in the handle.

I laving thus fully described the invention, what I claim as new, and desire to secure by Letters Patent is:

1. In a device of the class described, a saw blade having a transverse slot in its back edge and a plurality of curved slots opening through its rear end edge, each of said curved slots being struck from a center positioned near the lower end of said transverse slot, a handle provided with studs adapted to enter the curved slots and the transverse slot, whereby the blade and the handle are fitted into interlocking relation by a swinging movement of one part relative to the other part, a notch in the saw blade, and an automatic locking mechanism normally occupying a fixed position on the handle and adapted for ngagenient with said notch for locking sai blade and hamle against relative movement.

'2. In a device of the class described, a saw blade having a transverse, slot in its back edge and atiluralit Y of curved slots opening throu h its fear on edge, each of said curved slots. being' struck from a center positioned near the owefend of said transverse slot,

and each slot h Wing a downwardl extending portion oll'set "to the curve portion thereof, a. handle provided with studs adapted to enter the transverse and curved slots, whereby the blade and the handle are assembled into interloekin engagement by a swinging movement and by a subsequent sliding movement of one part relative to the other part, a notch in the saw blade, and an automatic locking mechanism having a sup porting member which oceu ies normally a fixed position on the hand e, said locking I mechanism being positioned for engagement with the notch and operating to lock the handle and the blade from relative m0ve ment.

3. In a deviee'of the class described, a handle )rovided with a kerf and with a groove, the atter being dovetailed in cross section, a blade occupying said kerf of the handle, acasing fitted snugly in said dovetailed groove of the handle, means for securing the casing fixedly in position in the handle, and a locking member sup )orted in the casing and interlocking with the blade.

4. In a device of the class described, a handle )rovidedwith a kerf and with a groove, the latter being dovetailed in cross section,

a slotted blade occupying said kerf, locking means fixed in the handle and engaging the slots in the blade, a casing occupying the groove in the handle, means for securing the casing fixedly in position, and locking mech anism cooperatilw with said casing for securing the blade to the handle.

5. In a device of the class described, a bandle provided with a saw blade kerf and with a groove which opens into said kerf, said groove being dovetailed in cross section; a slotted blade in said kerf, lockin membrs in the handle and engaging the slots of t e blade, a casing fittin snugly in the groove of 76 the handle, means or securin the casin from lengthwise movement, and a s ring-a tuated locking member held in said casin and adapted for engagement with said blade,

In testimony whereof I have signed my\ 80 name to this specification in the presence of two subscribing witnesses.

THOMAS P. J. COLEMAN. Witnesses:

JAB. H. GRIFFIN, l H. I. BERNHARD. 

